Exit presenter|Human Actions and Climate Evidence
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Hook

What changed in the last two centuries?

  • Industrial emissions, land clearing, wetland drainage — biomes and atmosphere respond.
  • Scientists ask: what is human-caused vs natural variability?
• Fossil fuel combustion → CO₂• Land-use change → CO₂, CH₄• Ice cores & tree rings → past CO₂ & temperatureMultiple independent lines of evidence support recent anthropogenic warming
Greenhouse gas sources and paleoclimate evidence